One of the earliest assaults on segregated transit in the South occurred in Louisville, Ky., in 1870-71. There, the city’s black community organized a successful protest that relied on nonviolent direct action, a tactic that would give shape to the modern civil rights movement nearly a century later.

In Boston, widely regarded as the center of the abolitionist movement, black leaders called on citizens to resist the newly passed Fugitive Slave Law in 1850 in order “to make Massachusetts a battlefield in defense of liberty.”

Two friends who attend different schools in the same community learn that one of their schools has no instruments for their music program, while the other has multiple different kinds. They use their friendship and musical abilities to confront this inequity and try to bring about change.